Hi @spotty ,
Sorry to hear you've had a bad experience here. We don't actually use email for support inquiries, so it's likely your emails were never received at whatever address you sent them to.
The best ways to get in touch are by Messaging, Live Chat, or Phone https://www.agl.com.au/help-support/contact-us
If you speak to the Resolutions team, they should be able to address this for you, and find out why you didn't receive the usual reminder. They can also set up a payment arrangement to avoid missing payments in future.